3 Best Sights in Northern Thailand, Thailand

The magnificent Hall of Opium is a white stucco, glass, marble, and aluminum building nestled in a valley above the Mekong. The site is so close to former poppy fields that a plan is still being considered to extend the complex to encompass an "open-air" exhibit of a functioning opium plantation. The museum traces the history of the entire drug trade, including a look at how mild stimulants like coffee and tea took hold in the West. It even attempts to give visitors a taste of the "opium experience" by leading them through a long tunnel where atmospheric music wafts between walls bearing phantasmagoric bas-relief scenes. The synthetic smell of opium was originally pumped into the tunnel but the innovation was dropped after official complaints.

It's an arresting introduction to an imaginatively designed and assembled exhibition, which reaches back into the murky history of the opium trade and takes a long look into a potentially darker future.

Opium is so linked to the history of Ban Sop Ruak that the small town now has two museums devoted to the subject. This smaller one is in the center of town. A commentary in English details the growing, harvesting, and smoking of opium. Many of the exhibits, such as carved teak opium boxes and jade and silver pipes, are fascinating.

Even if you don't stay overnight, pay a visit to this sumptuous resort that has the best views over the confluence of the Mae Sai, Ruak, and Mekong rivers.